JPH044122Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention is useful for repairing concrete structures by creating negative pressure in the defective voids of the concrete structure and then injecting a chemical solution into the surface of the concrete structure. This invention relates to an air suction tool for repairing concrete structures that is pressed against openings such as cracks and bulges in the concrete structure to suck out air in defective voids.

<Conventional Technology> As is well known, concrete buildings and structures tend to develop fine cracks on their surfaces after a long period of time, or the mortar sprayed onto the surface may float up, creating voids between the mortar and the structure. do. If defective voids such as cracks and raised voids are left untreated, they will gradually expand, causing part of the surface mortar or concrete to peel off or reduce strength. must be injected.

In order to inject a chemical solution into the defective void described above, as shown in FIG. At the same time, the opening of the crack between the substrates d and d is closed with a sealing material e, and a chemical liquid injection device is attached to the cylinder part c, and this injection device injects the chemical liquid from the cylinder part c into the crack a. to pump. In this case, if the chemical solution is injected after making the inside of the defect gap negative pressure in advance, the chemical solution can be injected sufficiently to the corners of the crack.

<Problems to be solved by the invention> However, the surface of the wall b of the concrete structure has unevenness in the surface mortar f as shown in Fig. 4, and grooves g in the tile joints as shown in Fig. 5. Therefore, if a conventional rubber vacuum pad is simply pressed against the concrete wall surface, a gap will be created between the concrete wall surface and the vacuum pad. For this reason, when the air in the defective gap is sucked out by the intake pump, the air in the defective gap cannot be sufficiently sucked.

Additionally, if a very flexible packing layer is provided around the periphery of the vacuum pad, the packing layer can be used when transporting or storing the vacuum pad (for example, during loading and unloading on a truck or during transportation to and from the work site). Since the packing layer becomes extremely flexible when a hard object hits it, the packing layer is easily damaged and cannot be put to practical use.

<Means for solving the problem> The present invention was proposed in view of the above, and includes a container-shaped mounting base provided at the tip of the intake pipe, and a container-shaped mounting base provided at the opening edge of the mounting base that expands when water is absorbed. A packing layer made of a softening super absorbent resin is provided.

<Function> With the above-described configuration, the packing layer of the present invention dries and shrinks and hardens when not in use, so the packing layer is less likely to be damaged, and when in use, the packing layer absorbs water, expands, and softens. Since the layer deforms into a shape corresponding to the unevenness of the surface of the concrete wall and comes into contact with it, no gap is created between it and the concrete surface.

<Embodiments> The present invention will be described below based on embodiments shown in the drawings.

The intake device 1 shown in FIG. 1 is provided with a hollow, substantially conical cup-shaped mounting base 4 made of synthetic rubber or the like at the tip of an intake pipe 3 having an intake valve 2, and a packing layer is formed on the opening edge of the mounting base 4. It consists of 5.

The packing layer 5 is attached to the base 4 with a super absorbent resin that expands and becomes extremely flexible when it absorbs water.
It is molded to match the shape of the opening edge 4' and is fixed with adhesive. Super absorbent resins include those made of acrylic acid and vinyl alcohol copolymer, and those made of sodium acrylate polymer. Both shrink and harden when dried, and when they absorb water, they become 600 to 1000 times more durable. It expands and turns into a gel. This super-absorbent resin does not release the absorbed water even when pressurized, has little drop in water content even after a long period of time, and can repeat a dry shrinkage state and a water absorption swelling state.

The mounting base 4 described above may have any shape, such as a bowl shape or a dish shape, as long as it has an opening.

How to use the intake device 1 having the above configuration,
As shown in FIG. 2, a case will be described in which a crack a penetrating from the front surface to the back surface of a wall surface b onto which mortar f has been sprayed is repaired.

In this case, first attach the injection tools 6 at appropriate intervals to the openings of the cracks a opening on the back side of the wall b, and then apply a sealing material such as adhesive tape to the openings where the injection tools 6 have come off. Furthermore, the opening of the crack a opening on the surface side of the wall surface b is sealed by pasting a sealing material except for the intake opening portion which comes into contact with the intake tool 1.

The injection tool 6 has a cylindrical portion 8 attached to a substrate 7 in which an injection port is provided.
One end is connected in an upright manner, and an injection valve 9 is provided at the other end of the cylindrical portion 8. A drug solution supply tube 10 of a drug solution injection device (not shown) is connected to the inlet of the injection valve 9. be. The injection tool 6 is provided with a packing layer (not shown) on the back surface of the substrate 7 so that it can be fixed to a rough concrete surface in a liquid-tight manner.

On the other hand, the suction device 1 has the above-described configuration, and before use, sufficient water is supplied to the packing layer 5 to gel it. Then, an intake tube 11 of an intake device such as a vacuum pump is connected to the mouthpiece 3' at one end of the intake pipe 3, and the opening of the mounting base 4 is pressed against the intake opening of the crack in the concrete wall b.

When the intake device is operated with the injection valve 9 of the injection device 6 closed, the air in the mounting base 4 is discharged from the through hole 12 through the intake pipe 3, and the inside of the mounting base 4 becomes negative pressure. When the inside of the mounting base 4 becomes negative pressure, the mounting base 4 is pressed against the concrete wall by atmospheric pressure, so the packing layer 5 is pressed against the concrete wall surface and deforms according to the irregularities of the mortar surface f. Therefore, the gap between the packing layer 5 and the concrete wall surface is sealed, and the packing layer 5 comes into close contact with the concrete wall surface, increasing airtightness. In addition, as described above, the packing layer 5 does not release water even when subjected to compressive force, so it maintains flexibility and
Reliably adheres to concrete walls. If the intake device continues to operate in this state, the air within the crack a is sucked out from the intake tool 1, and the inside of the crack a becomes negative pressure. When the pressure inside the crack a becomes sufficiently negative, the intake valve 2 is closed to temporarily stop the intake process. Then, the injection valve 9 is opened to operate the chemical liquid pressure feeding device,
A drug solution is supplied from the drug solution supply tube 10 to the injection tool 6. The chemical solution supplied into the injection tool 6 is applied to the crack a.
Due to the negative pressure inside and the pressurized chemical solution, it is sucked into the crack a without leaking to the outside, and diffuses within the crack a along the width of the crack a. After injecting an appropriate amount of the drug, the injection valve 9 of the injection tool 6 is closed to stop the injection process, and then the intake valve 2 of the suction tool 1 is opened to start the intake process again. When the intake process is restarted, the chemical solution injected from the injection tool 6 flows through the crack a toward the surface of the concrete wall due to the intake air from the intake tool 1. Therefore, even if the chemical liquid is highly viscous, it will flow into every corner of the crack a in a short time.

In this way, when the inside of the defective gap a is made negative pressure by the intake air from the suction device 1, and then the chemical solution is injected under pressure using the injection device 6, it is possible to fill the narrow corner of the defective gap a with a large amount of the chemical solution in a short time. can. Therefore, reliable repair effects can be expected,
Work time is short and work can be done efficiently.

Note that if the air intake device 1 is left unattended after the repair work is completed, the packing layer 5 gradually dries and shrinks and hardens. When the suction device 1 is to be used thereafter, water may be supplied again to make it flexible as described above.

<Effects of the Invention> As explained above, according to the present invention, the packing layer that absorbs water becomes extremely flexible, so that the packing layer deforms according to the unevenness of the concrete structure and adheres to the concrete structure in an airtight manner. Therefore, when repairing defective voids such as cracks in concrete structures with uneven decorative mortar or decorative tiles with grooved joints, or concrete structures with a roughened finish, it is necessary to repair defects such as cracks. In addition, it is possible to efficiently create a negative pressure inside the defect gap. Therefore, it is possible to fill every corner of the gap with the chemical solution, and not only can a sufficient repair effect be expected, but also the efficiency of the repair work is improved.

Furthermore, since the packing layer dries, contracts, and hardens when not in use, the packing layer is unlikely to be damaged even if a hard object hits the packing layer when transporting or storing the inhalation device according to the present invention.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a partially cutaway side view, Fig. 2 is a sectional view of a concrete wall showing the case where a chemical solution is injected into a crack penetrating the back side of the concrete wall, and Fig. FIG. 3 is a perspective view showing a conventional chemical injection state, FIG. 4 is a sectional view of a concrete wall sprayed with decorative mortar, and FIG. 5 is a sectional view of a concrete wall covered with decorative tiles. 1 is an inhalation device, 3 is an inhalation pipe, 4 is a mounting base, 5 is a packing layer, 6 is an injection device, 10 is a tube for supplying a chemical solution, and 11 is an inhalation tube.

Claims (1)

[Scope of utility model registration request] Repair of a concrete structure characterized in that a container-shaped mounting base is provided at the tip of an intake pipe, and a packing layer made of a highly water-absorbent resin that expands and softens when it absorbs water is provided on the opening edge of the mounting base. Air intake device.